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a standard showerhead in marty's house dispenses 7 gallons of water per minute. marty changed this showerhead to an energy-saving one. the equation shows the amount of water dispensed, y, as a function of the number of minutes, x, for the new showerhead.

y = 3x

how much water does marty save each day with the change in showerheads if he uses the shower for 8 minutes each day?